(57) A control signal generation apparatus for use in a digital information signal recording
system enables an optimum channel word of two channel words output from two precoders
to be recorded on a digital record medium. The control signal generation apparatus
compares (381 - 383) the same kind of components between peak, notch, and dip components
detected from the two channel words, and generates a control signal for selecting
an optimum channel word. Also, the apparatus comprises a gain controller (400) for
controlling gains with respect to integrators used for detecting the peak, notch,
and dip components. The gain controller (400) compares the detected peak, notch, and
dip components with the upper limit and lower limit reference set values, and generates
a gain control signal according to the comparison results. Accordingly, the present
invention can reduce the amount of the hardware circuitry, compared with the conventional
apparatus which adds the peak, notch, and dip components detected from an individual
channel word, and then compares the addition results with each other. Also, using
of an automatic gain controller allows the number of the maximum allowable bits to
be reduced, and an operational processing speed of an integrator to be increased.
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